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The next generation (NG) wireless system called Beyond 3G is envisioned as seamless worldwide wireless systems. Handover latency is an important metric for NG wireless system. This paper analyzes the handover latency of mobility support schemes including Mobile Ethernet. We compare various mobility support schemes from multiple viewpoints. For the quantitative evaluation, we introduce an analytical network model through a Markovian model. The sequence of location update frames in four schemes, i.e., Mobile Ethernet, a scheme of using MPLS, a scheme of using VLAN tag, and Mobile IPv6, formulates the handover latency and handover costs. The combination of the latency of each switch, router, and link defines handover latency. The feature of this analysis evaluates the latency of four schemes within the same model. Numerical result shows Mobile Ethernet achieves small handover latency. By means of analytical results about handover latency and handover costs, we consider the benefit of each scheme.

SUMMARYInteraction between emergency medical technicians (EMTs) and doctors is essential in emergency medical care. Doctors require diverse information related to a patient to provide efficient aid. In 2005, we started the Ikoma119 project and have developed a ubiquitous communication platform for emergency medical care called Mobile ER. Our platform, which is based on wireless internet technology, has such desirable properties as low-cost, location-independent service, and ease of service introduction. We provide an overview of our platform and describe the services that we have developed. We also discuss the remaining issues to realize our platform's actual operation. key words: emergency medical care, mobile network, Mobile IPv6, network mobility

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